Meade focal reducer

For Meade Schmidt-Cassegrain models. Threads into rear cell of any Meade SCT. May be used to increade field of view and reduce magnification for visual applications.

Reduces the telescope's focal ratio by a factor of 0. Simultaneously, the 41mm-diameter lens system helps flatten the field of Schmidt-Cassegrain models, significantly improving edge-of-field corrections.

Website by Opticstar official Meade UK importer. UK islands from. European Union from. Product code: Availability: Out of stock Incoming: To be confirmed.

Focal Reducer used with microfocuser

Product code: Availability: In stock Despatch: 2 business days. Meade LX85 Polar Scope. Meade Basic Camera Adapter. Meade Variable Projection Camera Adapter. Meade Variable Projection Tele-Extender. Meade 62 T-Adapter. Meade 64 T-Adapter. Meade 64ST T-thread Adapter. Meade Series Colour Filter Set 1. Meade Instruments UK warranty. Meade and Coronado product catalogue.Jump to content.

You currently have javascript disabled. Several functions may not work. Please re-enable javascript to access full functionality. Posted 08 April - AM. Posted 08 April - PM. Posted 15 April - AM. Community Forum Software by IP. Javascript Disabled Detected You currently have javascript disabled. Please log in to reply. I fitted it as first object on the scope before putting the microfocuser on top, since that was the only way that any connector screw threads seemed to work.

However, this appeared to stop the microfocusser from moving all the way in - the screws remained proud of the channels that they usually move inside when focussing.

Is this right? When trying to focus whilst using the telescope, I found that unless I focussed right the way in, I could see nothing.

Right at the end of the focus, I suddenly got everything OK, but that left me no room to manouvre. Would appreciate some help please Frances. Posted 15 April - AM Frances, I am a little bit surprised you are focusing by rotating the focus knob to the right i. Did you mean all the way to the left i. Also, just to be sure, you're using the focus knob and not the mirror lock knob, right? Anyway, what you are doing is certainly one way of using the focal reducer, though it's probably the least convenient.

What Mark is suggesting is the more standard and convenient way. By the way, your scope should have already come with the piece equivalent to the one Mark is suggesting. Put the SC onto the microfocuser as shown on p. Then put the focal reducer on the SC accessory adapter.

Your focal reducer if it's meade should also have come with an instruction sheet showing how to connect things to it.

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If you want to use the diagonal that came with the telescop which I'm assuming is 1. However, I would recommend a purchasing a 2" diagonal instead, most of which can be screwed directly on the focal reducer. Having said all this, let me note that focal reducers are designed primarily for imaging. If you are primarily a visual observer, let me recommend getting a lower-power eyepiece instead with a 2" diagonal. The view will be exactly the same as with a focal reducer, but it will be MUCH MUCH more convenient to use -- just swap the eyepieces, and usually no refocusing is necessary.

Back to LX Series. Sign In Need an account? Register now! I've forgotten my password. Remember me This is not recommended for shared computers. Sign in anonymously Don't add me to the active users list.This is an update to my previous Meade and Antares Focal Reducers report.

See the earlier report for unpacking and first use details. All of the visual and photograph tests reported here were with an OPT 2" star diagonal attached to the Meade Microfocuser.

Here you can see that there is essentially no clearance available from the mount base when using the Microfocuser:.

Without the Microfocuser in place, there would be no clearance problem, with or without a focal reducer attached. To use the Meade 1. However the Microfocuser could not be removed by just unscrewing the entire assembly from the telescope rear port, as it would hit the manual focuser knob on the back of the OTA.

It would have been necessary to unscrew three setscrews on the Microfocuser to remove the Microfocuser. As a result I did not test the focal reducers with the 1. For the tests reported here, I did not use the Off-Axis Guider. I will sometime in the future, and I'll report back with the results. I attached the Meade focal reducer to the Microfocuser and the 2" star diagonal to the reducer and inserted the Meade Series 26mm eyepiece.

I then aimed the telescope at the Double Cluster.

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However, I was unable to reach a focus. I tried several other eyepieces without being able to reach a focus with any of them. I did not try it without the Microfocuser; nor did I try any astrophotography with it.

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I have received a couple of reports that a bad batch of focal reducers was shipped last year. Perhaps mine is one of that batch. I will be returning the Meade focal reducer to OPT.

It was provided as an "evaluation unit". I then attached the Antares focal reducer to the Microfocuser and the 2" star diagonal to the reducer and inserted the Meade Series 26mm eyepiece. I could reach a focus. Both clusters were visible in the 26mm FOV. There was some distortion at the edge of the field of view. When viewing the Pleiades in the 30mm eyepiece, the main stars were just visible in the FOV. With a 50mm eyepiece, all the stars were easily visible; but there was more edge distortion.

The M31 galaxy was impressive in the 30mm eyepiece. Both companion galaxies were visible in the same FOV. Next, I did some astrophotography tests with the Antares focal reducer.

My first target was the Double Cluster. Here is what the camera captured 30 second exposure, ISO without the focal reducer. Only one of the clusters is visible. And here is the image 60 seconds, ISO with the Antares focal reducer.

Both clusters are visible. That's a rather dramatic improvement! I should mention that all the images used here are single frame, with no image stacking.

meade focal reducer

The raw images were edited in Aperture. Pretty amazing for a single frame image, even with some minor field rotation visible near the edge of the field. I am very pleased with the Antares focal reducer.Price Match Promise. We will try to match any price offered by another retailer. Click for details. Skywatcher 0. Antares 0.

This superb 0. The lens has a female 1. This superb fully multi-coated double-element focal reducer takes advantage of the latest computer aided design techniques to achieve the highest standards of performance to dramatically increase the field of view. This superb fully multi-coated multi-element focal reducer takes advantage of the latest computer aided design techniques to achieve the highest standards of performance set by the brand leaders at a fraction of the cost.

This superb fully multi-coated double-focal reducer takes advantage of the latest computer aided design techniques to achieve the highest standards of performance to dramatically increase the field of view. This clever accessory makes it possible to have a dual focal ratio instrument, without sacrificing image quality. Altair Lightwave 0. The Lightwave 0. Designed primarily for refractor telescopes of F6 or longer focal ratios. Vixen ED 0. Designed for serious Astro-Imagers.

William Optics 0. Brand new 0. Comes complete with integrated rotator and 2" filter holder. It reduces focal Length by 0. Increasing the field of view and decreasing the exposure time to dramatically increase your density or signal to noise ratio.

Show All Products.Optec has a long history of designing and manufacturing exceptional optical correctors and focal reducers beginning in with the original MAXfield 0. Improvements in CCD designed has warranted a complete redesign of our telecompressors which we offer now. These designs have been optimized by the premier Zemax optical design program and are made to the highest optical standards.

All optical surfaces are polished to a cosmetic quality and coated with a hard broadband coating for maximum transmission and durability.

No finer telecompressor is available. Optec's large 3-inch series telecompressors can cover a full 35mm imaging sensor without vignetting. The newest telecompressor available from Optec, the Lepus 0. Long back-focus allows the Lepus to cover imaging sensors up to 22mm in diagonal size without vignetting.

Multiple models are available that are optimized to work with specific telescope or camera systems. Click here for more information regarding the Lepus line of telecompressors. Designed by Ted Agos, this lens barrel and spacer kit allows any 43mm optical lens system to be installed into a 2-inch barrel assembly.

Click here for more information regarding the Agos Adapter Kit.

Meade f/6.3 Series 4000 Focal Reducer/Field Flattener

Now obsolete, these pages are still available for reference and review. Optec designer Gerald Persha provides a glossary of terms associated with optcial performance. Click here for an explanation of spot diagrams and modulation transfer functions MTF. Norman Koren explains the MTF here.

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Doc Greiner's original primer on focal reducers and correctors. Click here to visit the Wayback Machine Frequently updated and Highly Recommended! NGC Telecompressor Optec's large 3-inch series telecompressors can cover a full 35mm imaging sensor without vignetting. Lepus 0. Discontinued Telecompressors: Agos Adapter Kit Designed by Ted Agos, this lens barrel and spacer kit allows any 43mm optical lens system to be installed into a 2-inch barrel assembly.

Apus Webcam Telecompressors and Tele-extenders Now obsolete, these pages are still available for reference and review. Original MAXfield 0.JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser. Coronavirus Update: We are still accepting and shipping orders. Please click here for the latest update. Most amateur astronomers are familiar with a Barlow lens or a focal extendera negative or diverging lens that effectively increases the focal length and the focal ratio of a telescope's objective lens.

A longer effective focal length leads to higher magnification with a given eyepiece for visual observers. It also leads to larger although fainter images of extended objects like the Moon or planets for astrophotographers or visual observers. A focal reducer does just the opposite of a Barlow lens or focal extender. A reducer is a set of converging or positive lenses that cause the light from a telescope objective to converge at a steeper angle to the focal plane as if it were coming from an objective with a faster lower focal ratio and a shorter focal length.

When placed in the focal plane in front of a camera or eyepiece, a focal reducer leads to a wider field of view and a brighter image of extended objects, which is important for reducing the exposure times when imaging faint extended objects like nebulae or galaxies. A wider field of view and a lower magnification is also useful, with some focal reducers and with some eyepieces, for visual observers with telescopes with long focal ratios. In some cases, focal reducers also act as field flatteners by correcting for field curvature and coma of the objective lens.

This article explains the basics of how focal reducers work with an astronomy telescope.

meade focal reducer

It covers the basic optics and design specifications of a focal reducer, and goes through some practical factors to consider when selecting and using a focal reducer.

The design reduction factor of a focal reducer is the relative amount by which the effective focal length of the telescope is reduced when the focal reducer is used at its specified working distance or back focus. This factor is designated by a power that is less than 1, and it usually lies between 0. For example, with a 0. For example, a 0.

meade focal reducer

The Reduction Factor and the Amount of Reduction are inversely related. As one increases, the other decreases. Each focal reducer has a fixed specification called the working distance or required back focus. It's usually specified in millimeters. This is the distance at which the reducer must be placed in front of the eyepiece or camera focal plane in order to operate at the design reduction factor.

Most manufacturers provide this specification. It's usually specified from the base of the mounting threads on the reducer's housing, and this is the most practical way of providing this specification.

Some manufacturers will specify the working distance from the middle of the rear lens surface, and this number must then be converted into a practical working distance number by subtracting the amount by which the rear lens surface is recessed in its housing.

Most focal reducers are designed to operate optimally at the working distance in the optical path to achieve their specified reduction factor, which is usually between 0.

If the reducer is placed elsewhere, at a position called the operating distancethe focal reduction factor will not be as advertised.

Meade - f/6.3 Focal Reducer/Field Flattener

More about this below. The focal length of a focal reducer is usually measured from the rear lens surface of the reducer and not the reducer's housing.

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However, manufacturers virtually never provide this specification. The working distance or required back focus, explained above, is usually specified and is far more important in practice. Figure 2 shows the effective of a focal reducer on the light from a telescope objective.JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser. With this Meade Focal Reducer, imaging exposure times are roughly cut in half.

Delivers a wider field of view for visual observations. Threads directly onto 3. Reduces the effective focal length of Nagler-Petzval refractors by a factor of 0.

Best suited for typical 55 mm back focal length SLR camera bodies that accept T-rings.

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DSLR camera use requires a 2. Enables the use of Tele Vue 0. Provides a 0.

Telecompressors / Focal Reducers

Flattens the TV telescope's image field in order to optimize imaging results. Designed to fit standard 2" focusers as well as threaded TViis accessories.

Flattens the field in addition to reducing the effective focal length for fast, superior quality astro-imaging operations. Accepts standard T-rings for 35 mm cameras. Features 55 mm of backfocus to match that of a DSLR camera with appropriate t-ring. Accepts standard 2" filters as well as spacers with M42 threads for CCD imaging. Product is made to order for your specific telescope system. Once an order is placed our team will reach out if any additional information is needed, as well as provide anticipated shipping dates.

This item is in stock and typically ships in 1 day or less. Adjustment depends on the William Optics refractor with which the flattener is used. The flattener is produced with Ohara optical glass. Uses triplet design elements Provides full frame coverage Provides a 0. Image ratio is 1 : 1 Focus position is A focal reducer is an excellent tool to help you achieve the magnification you need, and at High Point Scientific, we provide you with the best selection.

A focal reducer, also known as a telecompressor, effectively reduces the focal length of your OTA, resulting in a wider field of view. They are also a great addition to any astrophotography set up as it can cut your exposure time down considerably.

Enjoy wide views of large objects such as nebulae with a faster lens speed! We also have a wide variety of correctors designed for flat-field correction or coma correction. A field corrector is vital for astro-imaging with certain telescope designs because it optimizes edge-of-field image quality. When observing with a Newtonian, coma correctors help reduce comatic aberration or coma. Without a coma corrector, Newtonians may show stars with comet-like tails.

Add a coma corrector to your set up to make sure you view celestial objects with pinpoint definition. Also, be sure to check out our extension tubes and adapters to make sure you achieve the necessary back focus for your set up. You will find focal reducers and correctors from all of the latest brands, including Celestron, Tele Vue, Baader, Takahashi, Sky-Watcher, and many more! Our experts have hand-selected each accessory to give you a quality selection of great products.

Top 5 tips for improving planetary views with your telescope

We are ready to help you get the best views out of your telescope! The brands we carry at High Point Scientific. The manufacturers listed at any given time during your search refinement offer at least one product that matches other search criteria you have already chosen. Minimum value. Love Astronomy?


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